Oral immunotherapy is used to help children with severe peanut allergies, and new research shows that the approach, which involves supervised daily exposure to the allergen, could also be effective for adults. During a monthslong study, participants ingested increasing amounts of peanut flour, and by the end, two-thirds could eat the equivalent of five peanuts and not have a reaction. This suggests the "window of opportunity for treating allergies could extend into adulthood," said The Guardian.